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TC1271AMVCT View Datasheet(PDF) - Microchip Technology

Part NameTC1271AMVCT Microchip
Microchip Technology Microchip
DescriptionVoltage Supervisor with Manual Reset Input
TC1271AMVCT Datasheet PDF : 40 Pages
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TC1270A/70AN/71A
4.2.3 POWER-DOWN/BROWN-OUTS
As the device powers-down/brown-outs, the VDD falls
from a voltage above the devices trip point (VTRIP). The
device will trip at a voltage between the maximum trip
point (VTRIP(MAX)) and the minimum trip point
(VTRIP(MIN)). Once the device voltage (VDD) goes
below this voltage, the RST/RST pin will be forced to
the active state.
Figure 4-8 shows the waveform of the RST pin as
determined by the VDD voltage. As the VDD voltage falls
from the normal operating point, the device “enters”
reset by crossing the VTRIP voltage (between
VTRIP(MAX) and VTRIP(MIN)). Then when VDD voltage
rises, the device “exits” reset by crossing the VTRIP volt-
age (below or at VTRIP(MAX)). After the “exit” state has
been detected, the Reset Delay Timer (tRST) starts.
Once the tRST time completes, the Reset pin is driven
inactive.
Table 4-3 shows the state of the RST or RST pins.
TABLE 4-3: RESET PIN STATES
Device
State of RST Pin when:
VDD < VTRIP VDD > VTRIP (1)
State of RST Pin when:
VDD < VTRIP VDD > VTRIP (1)
Output Driver
TC1270A
L
H
Push-Pull
TC1271A
H
L
Push-Pull
Note 1: The RST/RST pin will be driven inactive after the Reset Delay Timer (tRST) times out.
VDD
VTRIP
(with VDD Falling)
VTRIP
(with VDD Rising)
RST(1)
1V
< 1V is outside the
tRD
device specifications
tRST
tRD
tRST
FIGURE 4-8:
Note 1: The TC1270AN requires an external pull-up resistor.
RST Operation as determined by the VTRIP.
DS22035B-page 20
© 2007 Microchip Technology Inc.
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